WD_BLACK SN850X 1TB ($220) vs WD_BLACK SN7100 2TB ($290). $/TB analysis, performance, and use-case recommendations.
Both run on Gen 4 hardware but at different capacities: 1 TB for the WD_BLACK SN850X 1TB versus 2 TB for the WD_BLACK SN7100 2TB. Whether the larger drive's $/TB advantage justifies the higher upfront cost depends on how much you actually need.
Hardware-wise, the WD_BLACK SN850X 1TB runs on WD's G2 controller — manufactured by SanDisk and tuned for low-latency gaming workloads. The WD_BLACK SN7100 2TB pairs the SanDisk A101 — a more recent design from the WD/SanDisk lineup.
The cost difference is hard to ignore: 34% per TB (WD_BLACK SN7100 2TB at $145.00/TB versus WD_BLACK SN850X 1TB at $220.00/TB). Unless you specifically need the WD_BLACK SN850X 1TB's peak performance, the WD_BLACK SN7100 2TB delivers more storage for the money.
Cache architecture differs: WD_BLACK SN850X 1TB has DRAM hardware, WD_BLACK SN7100 2TB uses HMB. For OS, gaming, browsing — indistinguishable. For databases, large file ops, or 4K video editing — DRAM has a small but consistent edge.
Endurance leans toward the WD_BLACK SN7100 2TB at 1,200 TBW (versus 600 TBW for the WD_BLACK SN850X 1TB). For most consumers this never becomes a real concern — 600 TBW lasts a decade of normal writes — but heavy daily writers should weight it.
For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,250 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the WD_BLACK SN7100 2TB. Video editors will gravitate toward the WD_BLACK SN7100 2TB for its write headroom (6,900 MB/s sustained). Project saves and proxies move faster, which compounds across a workday. Heads-up — these are full-length 2280 drives. Steam Deck and most current handhelds require shorter 2230 modules, so check capacity-specific 2230 variants if that's your target platform.
Market context: the WD_BLACK SN850X 1TB ranks #2 of 4 Gen 4 1 TB drives we track by $/TB, while the WD_BLACK SN7100 2TB ranks #3 of 11 Gen 4 2 TB drives. One of them is genuinely among the cheapest options in its class, so this matchup includes a real value pick.
The WD_BLACK SN850X 1TB is the right call if the lower retail price ($220 vs $290), and a dedicated DRAM cache chip matter to you. Among Gen 4 flagships, the SN850X strikes a sweet spot — premium silicon at sub-Samsung pricing, with WD's established RMA process to back it up.
The WD_BLACK SN7100 2TB is the right call if better $/TB economics ($145.00/TB), and a higher TBW endurance rating (1,200 TBW) matter to you.